Reciprocating key-seating attachment for drills.



. ,Patented Apr.'29, |902. E. w. KELLEY.

RECIPHOCATING KEY SEATING ATTACHMENT FOB DRILLS.

` (Application led Aug. 2l, 1901.)

(No Model.)

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EDNARD lV. KELLEY, OF TAUNTON, MASSACHUSETTS.

RECIPROCATING KEY-SEATINGAT-TACHMENT FOR DRILLS.

. SPECIFICATION forming part of Letters Patent No. 698,709, dated April 29, 1902.

i n Application led August 21.1901. Serial No. 72,754. (No model.)

To @ZZ whom, it Netty concern:

Be it known that I, EDWARD W. KELLEY, a citizen of the United States, residing at Taunton, county of Bristol, State of Massachusetts, have invented an Improvement in Reciprocating Key-Seating Attachments for Drills, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention is an` attachment to be applied to usual power-drills for converting them temporarily into key-seating machines.

As at present practiced, cumbersome and expensive machines are required for making internal keyways, and it is the purpose of my present invention to obviate the necessity of these special machines by providing an inexpensive and simple attachment applicable to any ordinary power-drill, my present invention providing more particularly an attachment capable of making a key-seat in a very small hole, and for this reason I depend upon the reciprocating movement of the drill rather than upon its rotary movement.

In the drawings, Figure l is a broken detail, in side elevation, showing a portion'of a drilling-machine to which my attachment has been applied, the main portions of the operating mechanism of said machine being omitted, as my invention will be understood without them. Fig. 2 is acentral vertical section of the attachment. tion thereof, taken on the line 3 3, Fig. 2; and

Fig. 4 is a vertical sectional detail on the line 4, Fig. 3.

The table or work-support a, supported by an adjustable bracket a on a standard or column CL2 of the drill, which is provided with an overhanging arm a3, in the outer end of which is mounted a spindle-support or journal-bearing a, carrying a rack a5, operated by a pinion a6 and lever a7, is of usual construction, the same as found in the common power-drills. structed for coperation with such a usual drill or drilling-machine, is indicated at B as secured in place on the lower end of the reciprocating support a4.

The mechanism of my attachment is carried by a hanger b, whose upper end is composed of two parts l1 b2, secured by bolts b3 Fig. 3 is a horizontal sec-Q My attachment, specially con` for the purpose of clamping it rigidly in accurate position on the lower end of the support a4, the part b2 having an oifset or recess b4 for feedingr around the rack a5, as clearly shown in Figs. l and 2. The lower end of said hanger b is in the form of a stirrup or U shaped member b5, provided with a hollow threaded projection or boss b, on which is mounted a cap 197, internally threaded at its lower end to receive a slender tool-holder b5, provided at its lower end with a transverse slot, in which is mounted a chisel or cuttingtool c. This cutting-tool is preferably substantially as long as the length of the transverse slot in the tool-holder be and is provided at its upper side with a conical or inclined recess c', cooperating with the conical end d of a plunger d. Said plunger ,is threaded intermediate its length at d.2 to fit internalthreads b9 in the'tool-holder bs, by

means of which the plunger is fed forward for the purpose of advancing the cutter c.

The mechanism for advancing said cutter by the rotation of the plunger d is a step-by-step mechanism, shown as a ratchet, and comprising a sleeve e, passing down through the hollow boss b and secured at its lower end by a nut and check-nnte and at its upper end havingva ratchet-shoulder e2, engaging a ratchetlever c3, resting on the'bottom of the stirrup b5.Y The lever e3 is normally held in the position shown in Figs; 2 and 3 bya spring s, secured at one end e4 to the lever and at its other end to a prong e5 on the hanger. The lever e3 is moved in opposition to said spring v.by the lower end of a dog f, pivoted at f to the part b2 of the hanger and provided at its 1u er end with an inclined nose 2 for enga@- D ing with the arm a3 each time the drill-support a4 is moved upwardly.

Cooperating with the ratchet hub or flange Ie2 is a usual toothed doge", normally held by a spring s in engagement with saidl ratchet and arranged to be shifted by a thumb-nut e8 when it is desired to retract therplunger d -upon finishing a key-seat.

IOO

the upper end of the sleeve e, this distance corresponding to the length of the incline o and permitting,therefore,a full feeding movement of the tool c.

In operation when it is desired to make a key-seat in the hub of a wheel or in any other small hole or confined space the attachment B is simply put in place on any convenient drill, being clamped in position, as shown in Fig. 1, and then the drill-shaft support is reciprocated up and down by means of the usual hand-lever a7 and rack-and-pinion movement commonly found in such drills, the result being that at each reciprocation the lever f operates the ratchet of the plunger,thereby turning the plunger d a predetermined distance, and this rotation correspondingly lowers said 'plunger and wedges forward the tool c. This feed of the tool is positive and accurate, as the plunger is held rigidly by the threads d2 b9 against, backward movement and is held laterally by the supporting-holder bf. This construction permits the tool to operate in exceedingly small places and with the same precision which is accomplished by the usual expensive and complicated key-seating machines.

The attachment is entirely self-contained and may be placed quickly and readily upon any ordinary drill without requiring any change whatever in the latter.

My principal object has been to provide a simple attachment applicable to 'an ordinary drill, so as to practically do away with the necessity for the usual elaborate key-seating mai chines which at the present time are considered necessary for making keyways when required.

I do not intend to limit myself to all the details of construction above set forth, as will be evident from the appended claims.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is- Y 1. A reciprocating key-seating attachment for drills, comprising a hanger adapted to be removably attached to a reciprocable part of a usual drill, a tool-holder carried by said hanger, a transverse slot in said tool-holder, a cutting-tool or chisel mounted in said slot adapted to project from said tool-holder for cutting a keyway, and meansalso carried by said hanger for advancing said cutting-tool, said means including a step-by-step mechanism actuated by the reeiprocation of the hanger relatively to a stationary part of the drill.

2. A reciprocating key-seating attachment for drills, comprising a hanger adapted to be removably attached to the reciprocable drillshaft support, a hollow tool-holder secured rigidly to the outer end of said hanger and provided at its free end with a transverse slot, a cutting-tool movable in said slot and provided with an inclined upper surface,a threaded plunger rotatable in said holder and coperating with said inclined surface of the cutting-tool for feeding the latter, a ratchet mechanism also mounted on said hanger for rotating said plunger, and means carried by said hanger for coming into contact with a stationary part of the drill upon each reciprocation of the hanger for operating said ratchet.

3. A reciprocating ky-seating attachment for drills, comprising a hanger adapted to be removably attached to the reciprocable drillshaft support, said hanger on its lower end having a hollow threaded boss, a cap mounted thereon and having a threaded opening in line with said hollow boss,a tool-holder mounted at o ne end in said threaded opening and at its other end carrying a-radially-moving cutting-tool or chisel, a rotary plunger tting Within said tool-holder, said plunger and said tool-holder having cooperating screw-threads for feeding the plunger, and said tool having an inclined feeding-surface for cooperating with the plunger, a ratchet-sleeve mounted in said hollow boss above said tool-holder, the latter being connected to .rotate with said sleeve and mechanism for operating said ratchet-sleeve step by step as the drill-shaft support is reciprocated.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD W. KELLEY. [L s] Witnesses:

WM. E. KELLEY, BENJAMIN MORRIS. 

